With either the external battery which has always worked with it (and is charged) nor the internal AA's (alkaline).
This is an original Mix-Pre. It worked flawlessly for 5 recordings in NOLA then had a phantom issue at DnCo 6-11. then 6-15 kindms and I had it powered up fine with mics and the same battery.
With external nothing happens, no power light, can't get a slate light or when the p48 gets pushed ON no lights blink. With internals, no power light, but the slate light and when the p48 is pushed on the lights blink.
This unit belongs to kindms and of course it is in my possession when it malfunctions. yuk!
Any ideas?